if theme.chat_btn
  script.
    ((window.gitter = {}).chat = {}).options = {
      disableDefaultChat: true,
    };
    document.addEventListener('gitter-sidecar-ready', (e) => {
      const GitterChat = e.detail.Chat
      let chat

      function initGitter () {
        chat = new GitterChat({
          room: '#{theme.gitter.room}',
          activationElement: '#chat_btn'
        });
      }

      initGitter()

      if (!{theme.pjax.enable}) {
        document.addEventListener('pjax:complete', () => {
          chat.destroy()
          initGitter()
        })
      }

    })
else
  script.
    ((window.gitter = {}).chat = {}).options = {
      room: '#{theme.gitter.room}',
    };

    if (!{theme.chat_hide_show}) {
      function chatBtnHide () {
        document.getElementsByClassName('gitter-open-chat-button')[0].style.display= 'none'
      }

      function chatBtnShow () {
        document.getElementsByClassName('gitter-open-chat-button')[0].style.display= 'block'
      }
    }

script(src="https://sidecar.gitter.im/dist/sidecar.v1.js" async defer)